Microchip Technology ATmega4809 Xplained Pro, Manual

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Button SW1 can also be used as a reset button if PF6 is configured as the RESET pin in the ATmega4809. PF6 is
configured as a RESET pin by writing fuses. For more information, see the ATmega4809 data sheet.
Info: There is no pull-up resistor connected to the generic user button SW0. Remember to enable the
internal pull-up in the ATmega4809 to use the button. There is an external pull-up resistor connected to
SW1 connected to PF6.
Table 4-7. Mechanical Buttons
ATmega4809 Pin Silkscreen Text Shared Functionality
PB2 SW0 EXT2 , DGI GPIO0
PF6 SW1/RESET EXT2 , DEBUG , EDBG
4.3.3 LED
One yellow LED available on the ATmega4809 Xplained Pro board can be turned ON and OFF. Drive the connected
I/O line to GND to activate the LED.
Table 4-8. LED Connection
ATmega4809 Pin Function Shared Functionality
PB5 Yellow LED0 EXT2 , DGI GPIO3
4.3.4 Footprint for CryptoAuthentication
™
Devices
ATmega4809 Xplained Pro has one UDFN8 footprint for Microchip I
2
C CryptoAuthentication devices where several
models can be soldered on. The table below shows all the connections between the UDFN8 footprint and the
ATmega4809.
Info: ATSHA204A, ATAES132A, ATECC608A, and ATECC508A are examples of devices that can be
soldered onto the UDFN8 footprint.
Info: The footprint is connected to I
2
C pins on the ATmega4809.
Table 4-9. UDFN8 Footprint Connections
UDFN8 Footprint Pin ATmega4809 Pin Function Shared Functionality
1 [NC] — — —
2 [NC] — — —
3 [NC] — — —
4 [GND] — GND —
5 [SDA] PC2 TWI0 SDA EXT1 , EXT2 , EXT3 , mikroBUS
™
, EDBG DGI
6 [SCL] PC3 TWI0 SCL EXT1 , EXT2 , EXT3 , mikroBUS
™
, EDBG DGI
7 [NC] — —
8 [VCC] — VCC_TARGET —
9 [PAD] — GND —
ATmega4809 Xplained Pro
Hardware User Guide
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2020 Microchip Technology Inc.
User Guide
DS50002716C-page 17